Rock drill



Feb. 28, 1939.

w. M: ALEXANDER 2,148,420

ROCK DRILL Filed Nov. 30, 1935 Patented Feb. 28, 1939 ROCK DRILL William M. Alexander, Claremont, N. H., assignorto Sullivan Machinery Company, a corporation or Massachusetts Application November 30, 1935, Serial No. 52,324

1 Claim.

This invention relates to rock drilling mecha nisms, and more particularly to improvements in the supporting means for a rock drill of the socalled mounted drifter type, wherein an improved In this illustrative embodiment of the invention, there is shown a rock drill of the pneumatically fed, mounted drifter type with which the improved sliding swivel plate or trunnion is as sociated. The rock drill, generally designated I,

mounted on the feeding and guiding means, is of a conventional design having a hammer motor 2 for percussively actuating the drill steel 3. The feeding and guiding means is generally designated saddle of any well known form of rock drill support. The frame I! has guiding portions l9, It provided with concave bearing surfaces 21! engaging the exterior peripheries of the parallel feed cylinders 5, at the outer'sides of the latter (Cl. 255-51) 4r:

' sliding swivel plate or trunnion is employed. 4 and may be of the same general character as 5 An object of this invention is to provide an im-- that disclosed in Patent No. 1,955,744, granted proved rock drill supporting means. Another April 24, 1934:, and Patent No. 2,515,678 granted object is to provide an improved adjustable sup- October 1, 1935, and generally comprises parallel porting means embodying an adjustable swivel feed cylinders 5, 5, spaced transversely and conplate or trunnion. A further object is to provide nected together at their forward ends by a front 10' an improved sliding support for the swivel plate head member 5 and at their rearward ends by a or trunnion of a rock drill feeding and guiding transverse connecting member I. The front head means. A still further object is to provide in a member 6 has mounted thereon a detachable cenfeeding and guiding means of the pressure fluid tralizer or guide 8 of a suitable design for guiding actuated, parallel cylinder type, an improved slidthe drill steel during starting of a hole, and this 5 ing swivel plate or trunnion guided on the parcentralizer may be detached from the head memallel cylinders and embodying means for securber after the hole is started, in a well known ing the trunnion to the cylinders in the desired manner. The rock drill l is supported directly on position. A further object is to provide an imand between the cylind 53, 5 y the DIOViSiOn proved pneumatic feeding means of the parallel of a depen portion 9 Which y he of ta cylinder type wherein the rock drill is guided on longitudinal so a to p v d Su table bearthe exterior peripheries of the cylinders therebeg surfaces, while a clampi nt 0 is retween, I and having an imprcved liding Swive1 movably secured to and spaced from the portion plate or trunnion guided on the exterior periphas y SCTeW 1138 I. The elements 9 and I0 cries of the cylinders at the outer sides of the present arcuate hearing Surfaces p latter in a position out of the path of guided tiVe1y,S1id&b1y engaging the inner po t ons of the movement of the rock drill, and embodying means exterior peripheries of the y de s 5, 5- It Will for clamping th tr i t t li d r thus be seen that the rock drill is entirely sup- These and other objects of the invention will, Ported y d Slidable Oh the feed y nde s Withhowever, hereinafter more fully appear in the out the intermediation of y Other element, course of the following description, and at more thereby causing the fee l e s to perform particularly pointed out in the appended 1 all the functions of both feeding elements and In the accompanying drawing there is shown guiding elementsp c y mounted in the for purposes of illustration one form which the feed Cylinders 5, 5 are feed pistons 13, respectively, invention may assume in practice; having rearwardly extending piston rods l4 con- In t drawing-1.. nected at their rear ends to a transverse connect- Fig. 1 is a side elevational view of a rock drill head the rock drill being ured to the feeding and guiding means having em latter by a connecting rod, in the manner clearly therein the illustrative form of the improved sliddescribed in the above mentioned p he 40 ing swivel plate or trunnion. ,rock drill is provided with suitable throttle valve Fig 21 cross sectionag View, with parts Shown mechanism l6 for controlling the flow of pressure in end elevation, taken substantially on line 2-4 fluid the motor 2 and to the feed de s 5. 5, of 1 likewise in the manner clearly described in the Fig. 3 is a perspective view of the improved above mentioned p t-S. swivel plate or trunnion. Now referring to the improved sliding swivel Fig. 4 is a perspective View of one of the clamp Plate trunnion, it Will be noted that slid-ably ing 1 1119111 5, mounted on the feed cylinders is a bottom frame Fig. 5 is a detail sectional view taken on line having an integral Swivel p ate 01 trunnion 5 5 of Fig, 2, portion l8 adapted to be clamped in a suitable in a position out of the path of movement of the rock drill. Mounted within inclined guideways 2| formed in the side portions of the sliding frame l8 are clamp elements 22 having concave clamping surfaces 23 engaging the bottom portions of the feed cylinder peripheries, and having bolt-like threaded portions 24 engaged by tightening nuts 25. It will thus be seen that when the tightening nuts 25 are loosened, the sliding trunnion may he slid longitudinally along the parallel feed cylinders and clamped in the desired position, upon tightening of the nuts 25, securely to the feed cylinders by means of the clamping elements 22. As previously stated, the sliding trunnion mounting engages the feed cylinders entirely out of the path of movement of the rock drill along the inner portions of the peripheries, so that there is no interference therebetween. By the provision of the improved sliding trunnipn structure, the rock drill, when it is in supported position with respect to the work, may have its feed cylinders brought up into close adjacency with the Work, simply by sliding the feed cylinders relative to the trunnion, the latter thereafter being clamped in position to the feed cylinders. The sliding trunnion may also be employed in the changing of drill steels in the manner well known by those skilled in the art.

30 While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claim.

What I claim as new and desire to secure by Letters Patent is:

In a rock drilling mechanism, in combination, a rock drill, feeding means for said rock drill comprising a pair of parallel feed cylinders arranged in rigid spaced relation and having cylindrical exterior surfaces, means extending between said parallel cylinders providing concave inner guide surfaces slidably engaging the cylindrical exterior surfaces of said cylinders at the inner adjacent sides of the latter for slidably guiding and supporting the rock drill directly on said parallel cylinders, a sliding trunnion support for said feeding means having inner concave guide surfaces slidably engaging the exterior cylindrical surfaces of said cylinders at the outer remote sides of the latter out of the path of sliding movement of said drill guiding and supporting means for slidably mounting the trunnion support on said cylinders, and means for securing said sliding trunnion support to said feed cylinders including clamping elements guided on said trunnion support and having concave inner clamping surfaces engaging the cylindrical exterior surfaces of said feed cylinders at the bottoms of the latter.

WILLIAM M. ALEXANDER. 

